No. If you prefer not to download and install the Authy app, you may use a YubiKey as your preferred method of two-factor authentication.
Authy 2FA gives you multiple options for obtaining codes. You can use the mobile app for Android or iPhone or a desktop app which runs as a Chrome extension. Authy apps are instant, do not require continuous internet connection and the desktop app enables a seamless two-factor authentication experience.
You can find out more about these options on the Authy blog: http://blog.authy.com/multi-device
Read more here: https://authy.com/features/#better
A YubiKey is a small device that you register with your CoinfloorEX account and use every time you sign in.
You can find out more about YubiKeys here: https://www.yubico.com/why-yubico/for-individuals/ and here: https://www.yubico.com/2015/11/why-yubikey-wins/
You can purchase a compatible YubiKey on Amazon. CoinfloorEX supports 44-character YubiKey tokens. If you are a YubiKey VIP user, please use slot 2 to generate a valid token. FIDO U2F Security Key is not a compatible key.
If you've changed your phone number or wish to switch your 2FA method from Authy to YubiKey, please contact CoinfloorEX Support.